What are the genotypes of the parent Blahblah birds in the original cross?
What are the genotypes of the parent blahblah birds in the original cross? Silver – Bb. A cross between a blue blahblah bird & a white blahblah bird produces offspring that are silver. The color of blahblah birds is determined by just two alleles.
What is the phenotypic ratios of the offspring of two birds with silver feathers?
Silver x silver = BW x BW. Your results should be 25% of offspring are homozygous white (WW), 25% are homozygous blue (BB), and 50% are hybrid, which means they have silver feathers.
What is a multiple allele trait quizlet?
multiple alleles. there are more than two forms of the same gene, and there may be one more dominant form and several different phenotypes. Only $35.99/year. polygenic traits. controlled by the interaction of two or more genes; has a wide range of phenotypes.
What is the genotype of parents?
Each parent contributes one allele to each of its offspring. Thus, in this cross, all offspring will have the Bb genotype. Each parent contributes one allele to each of its offspring. Thus, in this cross, all offspring will have the Bb genotype.
What is genotype BB?
An organism with two dominant alleles for a trait is said to have a homozygous dominant genotype. Using the eye color example, this genotype is written BB. An organism with one dominant allele and one recessive allele is said to have a heterozygous genotype. In our example, this genotype is written Bb.
What are the genotypes of the offspring?
An offspring’s genotype is the result of the combination of genes in the sex cells or gametes (sperm and ova) that came together in its conception. One sex cell came from each parent. Sex cells normally only have one copy of the gene for each trait (e.g., one copy of the Y or G form of the gene in the example above).
How do you find a genotype?
A Punnett square is one of the simplest ways to determine genotype. The square is actually a mini-chart used to determine the potential genotype for an offspring with respect to particular trait.
How do you find the genotype ratio?
To find the genotypic ratio, count the number of times each combination appears in the grid, starting in the upper left square. The example in Figure 1 below is crossing alleles for just one trait, flower color. Larger Punnett squares are used to calculate genotypic ratios for more than one trait as shown in Figure 2.
What does polygenic mean quizlet?
Polygenic trait. trait controlled by two or more genes; shows a wide variety of phenotypes. Crossing over. the interchange of sections between pairing homologous chromosomes during the prophase of meiosis.
What is polygenic anthropology?
A polygenic trait is one whose phenotype is influenced by more than one gene. Traits that display a continuous distribution, such as height or skin color, are polygenic.
What is the total number of chromosomes in the karyotype of a person with Down syndrome?
Down syndrome (also known as trisomy 21) is an example of a condition caused by trisomy . People with Down syndrome typically have three copies of chromosome 21 in each cell, for a total of 47 chromosomes per cell.
How do you find the genotype of a parent?
To construct a Punnett square, the genotypes of both parents must be known. One parent’s alleles are listed across the top of the table, and the other parent’s alleles are listed down the left hand side. The resulting offspring genotypes are produced at the intersection of the parent’s alleles.
What are the genotypes of the parents in the Monohybrid cross?
For a monohybrid cross of two true-breeding parents, each parent contributes one type of allele. In this case, only one genotype is possible. All offspring are Yy and have yellow seeds. … Therefore, the offspring can potentially have one of four allele combinations: YY, Yy, yY, or yy.